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"Kaon" Definition

noun

Any of a subgroup of unstable mesons that consist of an electrically charged form with a mass 966 times that of an electron and a neutral form with a mass 974 times that of an electron, produced as a result of a high-energy particle collision. Also called K-meson. See Table at subatomic particle.

Source: American Heritage Dictionary

An unstable meson that occurs in both charged and neutral forms and is about 970 times more massive than an electron.

Source: Merriam-Webster